Search results for "Geodèsia"
showing 8 items of 8 documents
Multiwavelength study of accretion-powered pulsars
2010
My PhD thesis consists in a multi-frequency approach to High Mass X-ray Binaries (HMXBs), using infrared and X-ray data. On one side, my research project aimed at the identification and characterization of IR counterparts to obscured HMXBs in the Scutum and Norma inner galactic arms. The identification of optical/IR counterparts to HMXBs is a necessary step to undertake detailed studies of these systems. With data limited to the high-energy range, the understanding of their complex structure and dynamics cannot be complete. In the last years, INTEGRAL has revealed the presence of an important population of heavily absorbed HMXBs in the Scutum and Norma regions, virtually unobservable below …
A kinematic method to obtain conformal factors
2000
Radial conformal motions are considered in conformally flat space-times and their properties are used to obtain conformal factors. The geodesic case leads directly to the conformal factor of Robertson-Walker universes. General cases admitting homogeneous expansion or orthogonal hypersurfaces of constant curvature are analyzed separately. When the two conditions above are considered together a subfamily of the Stephani perfect fluid solutions, with acceleration Fermi-Walker propagated along the flow of the fluid, follows. The corresponding conformal factors are calculated and contrasted with those associated with Robertson-Walker space-times.
Evolution formalisms of Einstein equations: Numerical and Geometrical Issues
2009
The topic treated along this thesis is the theoretical and numerical study of formalisms of Einstein equations, with the final aim of applications to black holes and gravitational waves. The General Relativity theory of Einstein (1915) postulated that light and trajectories of all particles are curved by the geometry of spacetime. Schwarzschild a few months later and Kerr in 1963 found solutions which describe non-rotating and rotating black holes. From an astrophysical point of view, a stellar black hole can be seen as the final result of some kind of collapse of massive stars or merger of compact binaries objects. One of the predicted consequences of General Relativity, not detected yet, …
Bibliographia astronómica et geodaética hispánica, 1795-1905 : Volumen I : Introducción, Inventario A-Z
1990
El presente volumen contiene una primera aportación a la bibliografía astronómica y geodésica española comprendida entre los años 1795 y 1905. Incluye 1.198 referencias, de las que más de la mitad son libros y folletos. //. Aquest volum conté una primera aportació a la bibliografia astronòmica i geodèsica espanyola compresa entre els anys 1795 i 1905. Inclou 1.198 referències, de les quals més de la meitat són llibres i fullets.
Asteroseismology and mass loss in Be stars. Study with CoRoT
2010
The interiors of the stars are among the most difficult parts of the Universe to observe. Essentially, asteroseismology tries to make use of the oscillations to prove the stellar interiors, which are not directly observable. The basic principles of asteroseismology are, to a certain extent, similar to those developed and employed by Earth seismologists. Asteroseismology relies on advanced mathematical descriptions of oscillations in a three-dimensional body and numerical modeling. It is therefore a prominent example of interdisciplinary science. The general aim of this work is the study of Be stars with the CoRoT space mission. Classical Be stars are B-type stars that exhibit line emission …
New Insights into Galaxy Clusters: from Simulations to Observations
2011
The work carried out during this Thesis is framed within the field of Numerical Cosmology and focused on several broad lines intimately related which deal with the theoretical and numerical study of galaxy clusters: (i) the halo-finding problem, (ii) new improvements in cosmological simulations, and (iii) the formation and evolution of galaxy clusters. In spite of the achievements reached by Computational Cosmology in the last years, present-day hydrodynamics/N-body simulations still present important discrepancies with the observations, especially in the inner regions of massive galaxy clusters. Among these discrepancies we can cite, for instance, the breaking up of the self-similar scalin…
Provincia de Madrid triangulación catastral de conjunto
Data de publicació presa de la bibliografia. - Orientat amb fletxa. - Informació de les distàncies a l'est de la meridiana i nord de la perpendicular. - Full quadriculat. - Manca la part de la triangulació dels partits judicials de Torrelaguna i Sn. Martin de Valdeiglesias
Red geodésica de 1er. orden y nivelaciones de precisión de España
Llegenda